US Prescription Drugs Guide: Formularies, Coupons, and Paying Less
Prescription drug prices in the US are famously chaotic — the same pill can cost $4 or $400 depending on where and how you buy it. Here is how to pay less.
How Drug Coverage Works: Tiers and Formularies
Your insurance has a formulary — the list of covered drugs, organized into tiers:
- Tier 1: generics — lowest copay (often $5–15).
- Tier 2: preferred brand-name drugs — moderate copay.
- Tier 3: non-preferred brands — high copay or coinsurance.
- Tier 4/5: specialty drugs — often 25–33% coinsurance; can mean hundreds per month.
Prior authorization: for many brand-name and specialty drugs, your insurer requires your doctor to justify the prescription before they will pay. Start this process early — it can take days.
Step therapy: some plans require you to try a cheaper drug first and "fail" it before they cover the expensive one.
GoodRx and Discount Alternatives
GoodRx (goodrx.com): free coupons that often beat your insurance copay, especially for generics. Always compare the GoodRx price against your plan's copay — for cheap generics, the coupon frequently wins. Note: coupon purchases usually do not count toward your deductible.
Mark Cuban Cost Plus Drugs (costplusdrugs.com): sells generics at cost plus a fixed 15% markup — often dramatically cheaper than pharmacy retail for common generics.
$4 generic programs: Walmart, Costco, and many grocery pharmacies sell long lists of common generics for around $4/month. Costco's pharmacy is open to non-members in most states.
More Ways to Save
- Ask for generics. Tell every doctor "please prescribe the generic if one exists." Generics are FDA-required to be bioequivalent to brand drugs.
- 90-day mail order. Most plans offer 90-day supplies by mail at a lower per-month cost than three 30-day retail fills. Good for maintenance medications.
- Manufacturer coupons and patient assistance. Brand-name makers often offer copay cards (usually not valid with Medicare/Medicaid). For expensive drugs, ask about patient assistance programs.
- Split the check. If a drug is not covered, ask your doctor about therapeutic alternatives that are on your formulary.
Your Choice of Pharmacy Matters
Drug prices vary by pharmacy — the same prescription can cost double at one chain versus another. GoodRx shows prices across nearby pharmacies so you can comparison-shop. Independent pharmacies sometimes match or beat chain prices, and they are more likely to help with prior authorizations. If you use mail order, confirm it is your plan's preferred mail pharmacy; using a non-preferred one can cost more. And always ask the pharmacist: "Is there a cheaper way to fill this?" — pharmacists see pricing options patients never do.
Frequently asked questions
Why did my copay jump from $10 to $200?
Likely causes: the drug moved to a higher tier, your plan changed formularies at the new year, or you hit the deductible phase of a high-deductible plan. Call your insurer and ask — and check GoodRx in parallel.
Can I import cheaper drugs from Canada?
Personal importation is technically illegal, though enforcement against individuals is rare. Some states have programs; the FDA has authorized limited state importation plans. Do not rely on this as a strategy.
What if I cannot afford a prescribed drug?
Tell your doctor — they can often switch to a cheaper alternative. Also check NeedyMeds.org for assistance programs, and ask the pharmacy about discount cards.
Sources
- https://www.goodrx.com/
- https://www.cms.gov/priorities/key-initiatives/open-payments
- https://www.healthcare.gov/using-marketplace/